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We want to suggest the following based on our issues on kafka disks

We have many HDP clusters ( based on ambari , and all machines are redhat version 7.2 )

Each cluster include 3 kafka machines , while each kafka include disk with ~15 T

Because we have many issues that disk increased to 100% used capacity ( kafka Retention from some reason not works as should be )

Then we think about cron job that will run on kafka machines every min

And when kafka disk size will be for example - ~90%

then cron job will stop all kafka brokers ( kafka service )

And by this we avoid the kafka disk to became 100% , ( as all know when disk is 100% then the purging process will not works )

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